arch/x86/include/asm/kvm_host.h

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This header defines architecture specific interfaces, x86 version
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2.  See
   7  * the COPYING file in the top-level directory.
   8  *
   9  */
  10
  11 #ifndef _ASM_X86_KVM_HOST_H
  12 #define _ASM_X86_KVM_HOST_H
  13
  14 #include <linux/types.h>
  15 #include <linux/mm.h>
  16 #include <linux/mmu_notifier.h>
  17 #include <linux/tracepoint.h>
  18
  19 #include <linux/kvm.h>
  20 #include <linux/kvm_para.h>
  21 #include <linux/kvm_types.h>
  22
  23 #include <asm/pvclock-abi.h>
  24 #include <asm/desc.h>
  25 #include <asm/mtrr.h>
  26 #include <asm/msr-index.h>
  27
  28 #define KVM_MAX_VCPUS 64
  29 #define KVM_MEMORY_SLOTS 32
  30 /* memory slots that does not exposed to userspace */
  31 #define KVM_PRIVATE_MEM_SLOTS 4
  32
  33 #define KVM_PIO_PAGE_OFFSET 1
  34 #define KVM_COALESCED_MMIO_PAGE_OFFSET 2
  35
  36 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  37 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  38 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  39                                   0xFFFFFF0000000000ULL)
  40
  41 #define INVALID_PAGE (~(hpa_t)0)
  42 #define UNMAPPED_GVA (~(gpa_t)0)
  43
  44 /* KVM Hugepage definitions for x86 */
  45 #define KVM_NR_PAGE_SIZES       3
  46 #define KVM_HPAGE_SHIFT(x)      (PAGE_SHIFT + (((x) - 1) * 9))
  47 #define KVM_HPAGE_SIZE(x)       (1UL << KVM_HPAGE_SHIFT(x))
  48 #define KVM_HPAGE_MASK(x)       (~(KVM_HPAGE_SIZE(x) - 1))
  49 #define KVM_PAGES_PER_HPAGE(x)  (KVM_HPAGE_SIZE(x) / PAGE_SIZE)
  50
  51 #define DE_VECTOR 0
  52 #define DB_VECTOR 1
  53 #define BP_VECTOR 3
  54 #define OF_VECTOR 4
  55 #define BR_VECTOR 5
  56 #define UD_VECTOR 6
  57 #define NM_VECTOR 7
  58 #define DF_VECTOR 8
  59 #define TS_VECTOR 10
  60 #define NP_VECTOR 11
  61 #define SS_VECTOR 12
  62 #define GP_VECTOR 13
  63 #define PF_VECTOR 14
  64 #define MF_VECTOR 16
  65 #define MC_VECTOR 18
  66
  67 #define SELECTOR_TI_MASK (1 << 2)
  68 #define SELECTOR_RPL_MASK 0x03
  69
  70 #define IOPL_SHIFT 12
  71
  72 #define KVM_ALIAS_SLOTS 4
  73
  74 #define KVM_PERMILLE_MMU_PAGES 20
  75 #define KVM_MIN_ALLOC_MMU_PAGES 64
  76 #define KVM_MMU_HASH_SHIFT 10
  77 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  78 #define KVM_MIN_FREE_MMU_PAGES 5
  79 #define KVM_REFILL_PAGES 25
  80 #define KVM_MAX_CPUID_ENTRIES 40
  81 #define KVM_NR_FIXED_MTRR_REGION 88
  82 #define KVM_NR_VAR_MTRR 8
  83
  84 extern spinlock_t kvm_lock;
  85 extern struct list_head vm_list;
  86
  87 struct kvm_vcpu;
  88 struct kvm;
  89
  90 enum kvm_reg {
  91         VCPU_REGS_RAX = 0,
  92         VCPU_REGS_RCX = 1,
  93         VCPU_REGS_RDX = 2,
  94         VCPU_REGS_RBX = 3,
  95         VCPU_REGS_RSP = 4,
  96         VCPU_REGS_RBP = 5,
  97         VCPU_REGS_RSI = 6,
  98         VCPU_REGS_RDI = 7,
  99 #ifdef CONFIG_X86_64
 100         VCPU_REGS_R8 = 8,
 101         VCPU_REGS_R9 = 9,
 102         VCPU_REGS_R10 = 10,
 103         VCPU_REGS_R11 = 11,
 104         VCPU_REGS_R12 = 12,
 105         VCPU_REGS_R13 = 13,
 106         VCPU_REGS_R14 = 14,
 107         VCPU_REGS_R15 = 15,
 108 #endif
 109         VCPU_REGS_RIP,
 110         NR_VCPU_REGS
 111 };
 112
 113 enum kvm_reg_ex {
 114         VCPU_EXREG_PDPTR = NR_VCPU_REGS,
 115 };
 116
 117 enum {
 118         VCPU_SREG_ES,
 119         VCPU_SREG_CS,
 120         VCPU_SREG_SS,
 121         VCPU_SREG_DS,
 122         VCPU_SREG_FS,
 123         VCPU_SREG_GS,
 124         VCPU_SREG_TR,
 125         VCPU_SREG_LDTR,
 126 };
 127
 128 #include <asm/kvm_emulate.h>
 129
 130 #define KVM_NR_MEM_OBJS 40
 131
 132 #define KVM_NR_DB_REGS  4
 133
 134 #define DR6_BD          (1 << 13)
 135 #define DR6_BS          (1 << 14)
 136 #define DR6_FIXED_1     0xffff0ff0
 137 #define DR6_VOLATILE    0x0000e00f
 138
 139 #define DR7_BP_EN_MASK  0x000000ff
 140 #define DR7_GE          (1 << 9)
 141 #define DR7_GD          (1 << 13)
 142 #define DR7_FIXED_1     0x00000400
 143 #define DR7_VOLATILE    0xffff23ff
 144
 145 /*
 146  * We don't want allocation failures within the mmu code, so we preallocate
 147  * enough memory for a single page fault in a cache.
 148  */
 149 struct kvm_mmu_memory_cache {
 150         int nobjs;
 151         void *objects[KVM_NR_MEM_OBJS];
 152 };
 153
 154 #define NR_PTE_CHAIN_ENTRIES 5
 155
 156 struct kvm_pte_chain {
 157         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 158         struct hlist_node link;
 159 };
 160
 161 /*
 162  * kvm_mmu_page_role, below, is defined as:
 163  *
 164  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 165  *   bits 4:7 - page table level for this shadow (1-4)
 166  *   bits 8:9 - page table quadrant for 2-level guests
 167  *   bit   16 - direct mapping of virtual to physical mapping at gfn
 168  *              used for real mode and two-dimensional paging
 169  *   bits 17:19 - common access permissions for all ptes in this shadow page
 170  */
 171 union kvm_mmu_page_role {
 172         unsigned word;
 173         struct {
 174                 unsigned glevels:4;
 175                 unsigned level:4;
 176                 unsigned quadrant:2;
 177                 unsigned pad_for_nice_hex_output:6;
 178                 unsigned direct:1;
 179                 unsigned access:3;
 180                 unsigned invalid:1;
 181                 unsigned cr4_pge:1;
 182                 unsigned nxe:1;
 183         };
 184 };
 185
 186 struct kvm_mmu_page {
 187         struct list_head link;
 188         struct hlist_node hash_link;
 189
 190         struct list_head oos_link;
 191
 192         /*
 193          * The following two entries are used to key the shadow page in the
 194          * hash table.
 195          */
 196         gfn_t gfn;
 197         union kvm_mmu_page_role role;
 198
 199         u64 *spt;
 200         /* hold the gfn of each spte inside spt */
 201         gfn_t *gfns;
 202         /*
 203          * One bit set per slot which has memory
 204          * in this shadow page.
 205          */
 206         DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
 207         int multimapped;         /* More than one parent_pte? */
 208         int root_count;          /* Currently serving as active root */
 209         bool unsync;
 210         unsigned int unsync_children;
 211         union {
 212                 u64 *parent_pte;               /* !multimapped */
 213                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 214         };
 215         DECLARE_BITMAP(unsync_child_bitmap, 512);
 216 };
 217
 218 struct kvm_pv_mmu_op_buffer {
 219         void *ptr;
 220         unsigned len;
 221         unsigned processed;
 222         char buf[512] __aligned(sizeof(long));
 223 };
 224
 225 struct kvm_pio_request {
 226         unsigned long count;
 227         int cur_count;
 228         gva_t guest_gva;
 229         int in;
 230         int port;
 231         int size;
 232         int string;
 233         int down;
 234         int rep;
 235 };
 236
 237 /*
 238  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 239  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 240  * mode.
 241  */
 242 struct kvm_mmu {
 243         void (*new_cr3)(struct kvm_vcpu *vcpu);
 244         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 245         void (*free)(struct kvm_vcpu *vcpu);
 246         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 247         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 248                               struct kvm_mmu_page *page);
 249         int (*sync_page)(struct kvm_vcpu *vcpu,
 250                          struct kvm_mmu_page *sp);
 251         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
 252         hpa_t root_hpa;
 253         int root_level;
 254         int shadow_root_level;
 255         union kvm_mmu_page_role base_role;
 256
 257         u64 *pae_root;
 258         u64 rsvd_bits_mask[2][4];
 259 };
 260
 261 struct kvm_vcpu_arch {
 262         u64 host_tsc;
 263         /*
 264          * rip and regs accesses must go through
 265          * kvm_{register,rip}_{read,write} functions.
 266          */
 267         unsigned long regs[NR_VCPU_REGS];
 268         u32 regs_avail;
 269         u32 regs_dirty;
 270
 271         unsigned long cr0;
 272         unsigned long cr0_guest_owned_bits;
 273         unsigned long cr2;
 274         unsigned long cr3;
 275         unsigned long cr4;
 276         unsigned long cr4_guest_owned_bits;
 277         unsigned long cr8;
 278         u32 hflags;
 279         u64 pdptrs[4]; /* pae */
 280         u64 efer;
 281         u64 apic_base;
 282         struct kvm_lapic *apic;    /* kernel irqchip context */
 283         int32_t apic_arb_prio;
 284         int mp_state;
 285         int sipi_vector;
 286         u64 ia32_misc_enable_msr;
 287         bool tpr_access_reporting;
 288
 289         struct kvm_mmu mmu;
 290         /* only needed in kvm_pv_mmu_op() path, but it's hot so
 291          * put it here to avoid allocation */
 292         struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 293
 294         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 295         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 296         struct kvm_mmu_memory_cache mmu_page_cache;
 297         struct kvm_mmu_memory_cache mmu_page_header_cache;
 298
 299         gfn_t last_pt_write_gfn;
 300         int   last_pt_write_count;
 301         u64  *last_pte_updated;
 302         gfn_t last_pte_gfn;
 303
 304         struct {
 305                 gfn_t gfn;      /* presumed gfn during guest pte update */
 306                 pfn_t pfn;      /* pfn corresponding to that gfn */
 307                 unsigned long mmu_seq;
 308         } update_pte;
 309
 310         struct i387_fxsave_struct host_fx_image;
 311         struct i387_fxsave_struct guest_fx_image;
 312
 313         gva_t mmio_fault_cr2;
 314         struct kvm_pio_request pio;
 315         void *pio_data;
 316
 317         u8 event_exit_inst_len;
 318
 319         struct kvm_queued_exception {
 320                 bool pending;
 321                 bool has_error_code;
 322                 u8 nr;
 323                 u32 error_code;
 324         } exception;
 325
 326         struct kvm_queued_interrupt {
 327                 bool pending;
 328                 bool soft;
 329                 u8 nr;
 330         } interrupt;
 331
 332         int halt_request; /* real mode on Intel only */
 333
 334         int cpuid_nent;
 335         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 336         /* emulate context */
 337
 338         struct x86_emulate_ctxt emulate_ctxt;
 339
 340         gpa_t time;
 341         struct pvclock_vcpu_time_info hv_clock;
 342         unsigned int hv_clock_tsc_khz;
 343         unsigned int time_offset;
 344         struct page *time_page;
 345
 346         bool nmi_pending;
 347         bool nmi_injected;
 348
 349         struct mtrr_state_type mtrr_state;
 350         u32 pat;
 351
 352         int switch_db_regs;
 353         unsigned long db[KVM_NR_DB_REGS];
 354         unsigned long dr6;
 355         unsigned long dr7;
 356         unsigned long eff_db[KVM_NR_DB_REGS];
 357
 358         u64 mcg_cap;
 359         u64 mcg_status;
 360         u64 mcg_ctl;
 361         u64 *mce_banks;
 362
 363         /* used for guest single stepping over the given code position */
 364         u16 singlestep_cs;
 365         unsigned long singlestep_rip;
 366         /* fields used by HYPER-V emulation */
 367         u64 hv_vapic;
 368 };
 369
 370 struct kvm_mem_alias {
 371         gfn_t base_gfn;
 372         unsigned long npages;
 373         gfn_t target_gfn;
 374 #define KVM_ALIAS_INVALID     1UL
 375         unsigned long flags;
 376 };
 377
 378 #define KVM_ARCH_HAS_UNALIAS_INSTANTIATION
 379
 380 struct kvm_mem_aliases {
 381         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 382         int naliases;
 383 };
 384
 385 struct kvm_arch {
 386         struct kvm_mem_aliases *aliases;
 387
 388         unsigned int n_free_mmu_pages;
 389         unsigned int n_requested_mmu_pages;
 390         unsigned int n_alloc_mmu_pages;
 391         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 392         /*
 393          * Hash table of struct kvm_mmu_page.
 394          */
 395         struct list_head active_mmu_pages;
 396         struct list_head assigned_dev_head;
 397         struct iommu_domain *iommu_domain;
 398         int iommu_flags;
 399         struct kvm_pic *vpic;
 400         struct kvm_ioapic *vioapic;
 401         struct kvm_pit *vpit;
 402         int vapics_in_nmi_mode;
 403
 404         unsigned int tss_addr;
 405         struct page *apic_access_page;
 406
 407         gpa_t wall_clock;
 408
 409         struct page *ept_identity_pagetable;
 410         bool ept_identity_pagetable_done;
 411         gpa_t ept_identity_map_addr;
 412
 413         unsigned long irq_sources_bitmap;
 414         u64 vm_init_tsc;
 415         s64 kvmclock_offset;
 416
 417         struct kvm_xen_hvm_config xen_hvm_config;
 418
 419         /* fields used by HYPER-V emulation */
 420         u64 hv_guest_os_id;
 421         u64 hv_hypercall;
 422 };
 423
 424 struct kvm_vm_stat {
 425         u32 mmu_shadow_zapped;
 426         u32 mmu_pte_write;
 427         u32 mmu_pte_updated;
 428         u32 mmu_pde_zapped;
 429         u32 mmu_flooded;
 430         u32 mmu_recycled;
 431         u32 mmu_cache_miss;
 432         u32 mmu_unsync;
 433         u32 remote_tlb_flush;
 434         u32 lpages;
 435 };
 436
 437 struct kvm_vcpu_stat {
 438         u32 pf_fixed;
 439         u32 pf_guest;
 440         u32 tlb_flush;
 441         u32 invlpg;
 442
 443         u32 exits;
 444         u32 io_exits;
 445         u32 mmio_exits;
 446         u32 signal_exits;
 447         u32 irq_window_exits;
 448         u32 nmi_window_exits;
 449         u32 halt_exits;
 450         u32 halt_wakeup;
 451         u32 request_irq_exits;
 452         u32 irq_exits;
 453         u32 host_state_reload;
 454         u32 efer_reload;
 455         u32 fpu_reload;
 456         u32 insn_emulation;
 457         u32 insn_emulation_fail;
 458         u32 hypercalls;
 459         u32 irq_injections;
 460         u32 nmi_injections;
 461 };
 462
 463 struct descriptor_table {
 464         u16 limit;
 465         unsigned long base;
 466 } __attribute__((packed));
 467
 468 struct kvm_x86_ops {
 469         int (*cpu_has_kvm_support)(void);          /* __init */
 470         int (*disabled_by_bios)(void);             /* __init */
 471         int (*hardware_enable)(void *dummy);
 472         void (*hardware_disable)(void *dummy);
 473         void (*check_processor_compatibility)(void *rtn);
 474         int (*hardware_setup)(void);               /* __init */
 475         void (*hardware_unsetup)(void);            /* __exit */
 476         bool (*cpu_has_accelerated_tpr)(void);
 477         void (*cpuid_update)(struct kvm_vcpu *vcpu);
 478
 479         /* Create, but do not attach this VCPU */
 480         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 481         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 482         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 483
 484         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 485         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 486         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 487
 488         void (*set_guest_debug)(struct kvm_vcpu *vcpu,
 489                                 struct kvm_guest_debug *dbg);
 490         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 491         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 492         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 493         void (*get_segment)(struct kvm_vcpu *vcpu,
 494                             struct kvm_segment *var, int seg);
 495         int (*get_cpl)(struct kvm_vcpu *vcpu);
 496         void (*set_segment)(struct kvm_vcpu *vcpu,
 497                             struct kvm_segment *var, int seg);
 498         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 499         void (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu);
 500         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 501         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 502         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 503         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 504         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 505         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 506         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 507         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 508         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 509         int (*get_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long *dest);
 510         int (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value);
 511         void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 512         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 513         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 514         void (*fpu_activate)(struct kvm_vcpu *vcpu);
 515         void (*fpu_deactivate)(struct kvm_vcpu *vcpu);
 516
 517         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 518
 519         void (*run)(struct kvm_vcpu *vcpu);
 520         int (*handle_exit)(struct kvm_vcpu *vcpu);
 521         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 522         void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 523         u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 524         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 525                                 unsigned char *hypercall_addr);
 526         void (*set_irq)(struct kvm_vcpu *vcpu);
 527         void (*set_nmi)(struct kvm_vcpu *vcpu);
 528         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 529                                 bool has_error_code, u32 error_code);
 530         int (*interrupt_allowed)(struct kvm_vcpu *vcpu);
 531         int (*nmi_allowed)(struct kvm_vcpu *vcpu);
 532         bool (*get_nmi_mask)(struct kvm_vcpu *vcpu);
 533         void (*set_nmi_mask)(struct kvm_vcpu *vcpu, bool masked);
 534         void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
 535         void (*enable_irq_window)(struct kvm_vcpu *vcpu);
 536         void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
 537         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 538         int (*get_tdp_level)(void);
 539         u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
 540         int (*get_lpage_level)(void);
 541         bool (*rdtscp_supported)(void);
 542
 543         const struct trace_print_flags *exit_reasons_str;
 544 };
 545
 546 extern struct kvm_x86_ops *kvm_x86_ops;
 547
 548 int kvm_mmu_module_init(void);
 549 void kvm_mmu_module_exit(void);
 550
 551 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 552 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 553 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 554 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 555 void kvm_mmu_set_base_ptes(u64 base_pte);
 556 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 557                 u64 dirty_mask, u64 nx_mask, u64 x_mask);
 558
 559 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 560 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 561 void kvm_mmu_zap_all(struct kvm *kvm);
 562 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 563 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 564
 565 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 566
 567 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 568                           const void *val, int bytes);
 569 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 570                   gpa_t addr, unsigned long *ret);
 571 u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
 572
 573 extern bool tdp_enabled;
 574
 575 enum emulation_result {
 576         EMULATE_DONE,       /* no further processing */
 577         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 578         EMULATE_FAIL,         /* can't emulate this instruction */
 579 };
 580
 581 #define EMULTYPE_NO_DECODE          (1 << 0)
 582 #define EMULTYPE_TRAP_UD            (1 << 1)
 583 #define EMULTYPE_SKIP               (1 << 2)
 584 int emulate_instruction(struct kvm_vcpu *vcpu,
 585                         unsigned long cr2, u16 error_code, int emulation_type);
 586 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 587 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 588 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 589 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 590                    unsigned long *rflags);
 591
 592 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 593 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 594                      unsigned long *rflags);
 595 void kvm_enable_efer_bits(u64);
 596 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 597 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 598
 599 struct x86_emulate_ctxt;
 600
 601 int kvm_emulate_pio(struct kvm_vcpu *vcpu, int in,
 602                      int size, unsigned port);
 603 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, int in,
 604                            int size, unsigned long count, int down,
 605                             gva_t address, int rep, unsigned port);
 606 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 607 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 608 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 609 int emulate_clts(struct kvm_vcpu *vcpu);
 610 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 611                     unsigned long *dest);
 612 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 613                     unsigned long value);
 614
 615 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 616 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 617                                 int type_bits, int seg);
 618
 619 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 620
 621 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 622 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 623 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 624 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 625 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 626 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 627 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 628
 629 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 630 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 631
 632 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu);
 633 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
 634
 635 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 636 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 637 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 638                            u32 error_code);
 639 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);
 640
 641 int kvm_pic_set_irq(void *opaque, int irq, int level);
 642
 643 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 644
 645 void fx_init(struct kvm_vcpu *vcpu);
 646
 647 int emulator_write_emulated(unsigned long addr,
 648                             const void *val,
 649                             unsigned int bytes,
 650                             struct kvm_vcpu *vcpu);
 651
 652 unsigned long segment_base(u16 selector);
 653
 654 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 655 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 656                        const u8 *new, int bytes,
 657                        bool guest_initiated);
 658 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 659 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 660 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 661 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 662 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 663
 664 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 665
 666 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 667
 668 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 669 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
 670
 671 void kvm_enable_tdp(void);
 672 void kvm_disable_tdp(void);
 673
 674 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 675 int complete_pio(struct kvm_vcpu *vcpu);
 676
 677 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn);
 678
 679 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 680 {
 681         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 682
 683         return (struct kvm_mmu_page *)page_private(page);
 684 }
 685
 686 static inline u16 kvm_read_fs(void)
 687 {
 688         u16 seg;
 689         asm("mov %%fs, %0" : "=g"(seg));
 690         return seg;
 691 }
 692
 693 static inline u16 kvm_read_gs(void)
 694 {
 695         u16 seg;
 696         asm("mov %%gs, %0" : "=g"(seg));
 697         return seg;
 698 }
 699
 700 static inline u16 kvm_read_ldt(void)
 701 {
 702         u16 ldt;
 703         asm("sldt %0" : "=g"(ldt));
 704         return ldt;
 705 }
 706
 707 static inline void kvm_load_fs(u16 sel)
 708 {
 709         asm("mov %0, %%fs" : : "rm"(sel));
 710 }
 711
 712 static inline void kvm_load_gs(u16 sel)
 713 {
 714         asm("mov %0, %%gs" : : "rm"(sel));
 715 }
 716
 717 static inline void kvm_load_ldt(u16 sel)
 718 {
 719         asm("lldt %0" : : "rm"(sel));
 720 }
 721
 722 static inline void kvm_get_idt(struct descriptor_table *table)
 723 {
 724         asm("sidt %0" : "=m"(*table));
 725 }
 726
 727 static inline void kvm_get_gdt(struct descriptor_table *table)
 728 {
 729         asm("sgdt %0" : "=m"(*table));
 730 }
 731
 732 static inline unsigned long kvm_read_tr_base(void)
 733 {
 734         u16 tr;
 735         asm("str %0" : "=g"(tr));
 736         return segment_base(tr);
 737 }
 738
 739 #ifdef CONFIG_X86_64
 740 static inline unsigned long read_msr(unsigned long msr)
 741 {
 742         u64 value;
 743
 744         rdmsrl(msr, value);
 745         return value;
 746 }
 747 #endif
 748
 749 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 750 {
 751         asm("fxsave (%0)":: "r" (image));
 752 }
 753
 754 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 755 {
 756         asm("fxrstor (%0)":: "r" (image));
 757 }
 758
 759 static inline void kvm_fx_finit(void)
 760 {
 761         asm("finit");
 762 }
 763
 764 static inline u32 get_rdx_init_val(void)
 765 {
 766         return 0x600; /* P6 family */
 767 }
 768
 769 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 770 {
 771         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 772 }
 773
 774 #define TSS_IOPB_BASE_OFFSET 0x66
 775 #define TSS_BASE_SIZE 0x68
 776 #define TSS_IOPB_SIZE (65536 / 8)
 777 #define TSS_REDIRECTION_SIZE (256 / 8)
 778 #define RMODE_TSS_SIZE                                                  \
 779         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 780
 781 enum {
 782         TASK_SWITCH_CALL = 0,
 783         TASK_SWITCH_IRET = 1,
 784         TASK_SWITCH_JMP = 2,
 785         TASK_SWITCH_GATE = 3,
 786 };
 787
 788 #define HF_GIF_MASK             (1 << 0)
 789 #define HF_HIF_MASK             (1 << 1)
 790 #define HF_VINTR_MASK           (1 << 2)
 791 #define HF_NMI_MASK             (1 << 3)
 792 #define HF_IRET_MASK            (1 << 4)
 793
 794 /*
 795  * Hardware virtualization extension instructions may fault if a
 796  * reboot turns off virtualization while processes are running.
 797  * Trap the fault and ignore the instruction if that happens.
 798  */
 799 asmlinkage void kvm_handle_fault_on_reboot(void);
 800
 801 #define __kvm_handle_fault_on_reboot(insn) \
 802         "666: " insn "\n\t" \
 803         ".pushsection .fixup, \"ax\" \n" \
 804         "667: \n\t" \
 805         __ASM_SIZE(push) " $666b \n\t"        \
 806         "jmp kvm_handle_fault_on_reboot \n\t" \
 807         ".popsection \n\t" \
 808         ".pushsection __ex_table, \"a\" \n\t" \
 809         _ASM_PTR " 666b, 667b \n\t" \
 810         ".popsection"
 811
 812 #define KVM_ARCH_WANT_MMU_NOTIFIER
 813 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 814 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 815 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 816 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
 817 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
 818 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
 819 int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
 820
 821 void kvm_define_shared_msr(unsigned index, u32 msr);
 822 void kvm_set_shared_msr(unsigned index, u64 val, u64 mask);
 823
 824 #endif /* _ASM_X86_KVM_HOST_H */